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Occultation vs. transit vs. eclipse

Planetary alignment occurs when two or more planets form a line with the sun, sometime during their respective orbits.

So consider approximately how long the following planets take to revolve around the sun...

Assuming the planets start in an aligned state, how many revolutions will it take each planet before they are aligned again in the same position?

Planet	Revolutions
Mercury	Your answer should be an integer, like $6$ ‍ an exact decimal, like $0.75$ ‍ a simplified proper fraction, like $3 / 5$ ‍ a simplified improper fraction, like $7 / 4$ ‍ a mixed number, like $1 3 / 4$ ‍
Venus	Your answer should be an integer, like $6$ ‍ an exact decimal, like $0.75$ ‍ a simplified proper fraction, like $3 / 5$ ‍ a simplified improper fraction, like $7 / 4$ ‍ a mixed number, like $1 3 / 4$ ‍
Earth	Your answer should be an integer, like $6$ ‍ an exact decimal, like $0.75$ ‍ a simplified proper fraction, like $3 / 5$ ‍ a simplified improper fraction, like $7 / 4$ ‍ a mixed number, like $1 3 / 4$ ‍
Mars	Your answer should be an integer, like $6$ ‍ an exact decimal, like $0.75$ ‍ a simplified proper fraction, like $3 / 5$ ‍ a simplified improper fraction, like $7 / 4$ ‍ a mixed number, like $1 3 / 4$ ‍

Stuck?

NASA